CODEWITHSUNDEEP
objective-ccore-datanspredicate
cfischer
cfischer

Reputation: 24912

NSPredicate interpreting a keyPath instead of a property

I have a Core Data database of Recipes. Each Recipe has an ingredients relationship (many to many), so my XYZRecipe object has a ingredients property that points to an NSSet of XYZIngredients.

I want an NSPredicate to select all the Recipes that have more than 5 ingredients and tried this:

NSPredicate *p = [NSPredicate predicateWithFormat:@"ingredients.count > 5"];

This fails, and complains that the class XYZIngredient is not key value compliant for count.

Clearly "ingredients.count" is being interpreted as a keyPath instead of returning the ingredients property of each recipe.

Is there a way around this?

Upvotes: 0

Views: 136

Answers (1)

Amin Negm-Awad
Amin Negm-Awad

Reputation: 16660

It should be possible to solve that problem on KVC side and on Core Data side:

KVC:

@"ingredients.@count > 5"

Should deliver the count of ingredients as the result of the key path.

Core Data:

@"ingredients[SIZE] > 5"

Upvotes: 2

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